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Debt Debt Fair Value Adjustments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Amortization Period of Deferred Gain (Loss) on Discontinuation of Fair Value Hedge 16 years  
Purchase accounting debt fair value adjustments $ 658 $ 719
Carrying value adjustment to hedged debt 2 115
Unamortized portion of proceeds received from the early termination of interest rate swap agreements 275 297
Unamortized debt discounts, net (74) (74)
Unamortized debt issuance costs (130) (130)
Total debt fair value adjustments $ 731 $ 927